What a broken or jammed finger is
Each finger has three bones (phalanges; the thumb has two) and three joints: the knuckle, the middle joint and the end joint. A broken finger can be a crack, a break across or along a bone, a break into a joint, a small flake of bone pulled off by a ligament or tendon, or a crushed fingertip (a tuft fracture).
A jammed finger is usually a sprain of the middle joint, most often of the volar plate, the strong ligament on the palm side that stops the joint bending backwards. It can pull off a small flake of bone, which is treated like the sprain, without surgery. A dislocated finger, most often at the middle joint, has come out of joint and is usually put back in A&E, often under local anaesthetic; some dislocations come with a fracture.
Sources 1, 2, 3, 4, 5
Who gets it
Falls, ball sports, crushing in doors or tools, road accidents and fights. In 261 adults with 283 finger fractures at one German trauma centre (average age 40, with 2.7 men for every woman), crushes (33%) and falls (23%) were the commonest causes, the fingertip bone was broken most often (43%), the ring finger was the most often affected, and 74% of the breaks were treated without surgery.
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How it's recognised, and two tendon injuries that look like a sprain
Pain, swelling, bruising and difficulty moving the finger; it may change colour or feel numb. The NHS says it can be hard to tell a broken finger from a dislocated or badly sprained one, so you'll probably need an X-ray. A doctor looks at the finger from the end, with the fingers straight and in a fist, to see whether it overlaps its neighbour, points the wrong way or looks short, and checks the tendons and nerves.
A middle joint that can't straighten on its own after a stubbing injury may be a torn tendon on the back of the finger (a boutonnière injury), and the typical bent posture may not appear for days or weeks; it is splinted differently from a sprain. A finger that can't bend, or lies straighter than its neighbours, after a cut or a violent pull may have a torn tendon on the palm side, which won't heal on its own and needs to be seen the same day.
Sources 8, 2, 9, 10, 25
How it's treated: your team's choice
Most closed finger fractures are treated without surgery. UK hand surgery standards say an operation should be chosen only when it will do better than non-surgical care, with early hand therapy either way. Options include buddy strapping, a splint or occasionally a cast; setting a displaced break under local anaesthetic; or an operation for a break that is unstable, twisted, badly displaced, into a joint, or one of several.
A cut over the break (an open fracture) needs same-day review, cleaning and antibiotics, and a crushed fingertip with a cut nail bed usually needs washing out and dressing. Breaks of the thumb, and a torn ligament at the base of the thumb (skier's thumb), are managed differently and aren't covered here.
Sources 11, 8, 2, 12, 13, 14
How it heals
Finger fractures usually heal in 6 to 8 weeks, though it can take longer, and it may be 3 to 4 months before full strength returns. Stiffness is common at first and settles with exercise and use; an ache in cold, damp weather, after heavy use or a knock is common and improves with time, and breaks into a joint carry some risk of arthritis later.
A jammed middle joint can stay swollen and a little painful for 1 to 2 years, and some people lose a little straightening. In a UK study of people with finger fractures and joint injuries, their own ratings of hand function improved over 6 months but hadn't got back to how they were before the injury, and in interviews people said the injury affected their lives more than they'd expected.
Sources 8, 7, 4, 15, 16, 17
Children
Children's finger fractures usually heal well. One NHS children's service buddy-straps simple finger and hand fractures full time for 3 weeks and discharges children without follow-up unless problems arise. Research on children's hand fractures is thin: only 3 studies met a 2026 review's criteria. A fingertip crushed in a door is common in children, and if the nail bed is badly damaged it may need an operation under general anaesthetic the same day.
Sources 18, 19, 13